Process and intermediates for preparing 3-[4-(disubstituted-amino)phenyl] or

ABSTRACT

3-[4-(Disubstituted-amino)phenyl] or (9-julolidinyl)-3-(diphenylamino)phthalides useful as color formers in pressure-sensitive and thermal marking systems are prepared by reaction of 2-[4-(disubstituted-amino)benzoyl] or (9-julolidinyl-carbonyl)benzoic acids with diphenylamines.

This application is a division of application Ser. No. 19,594 filed Mar.12, 1979 now U.S. Pat. No. 4,200,313 issued Apr. 29, 1980, in turn adivision of application Ser. No. 942,996 filed Sept. 18, 1978, now U.S.Pat. No. 4,187,223 issued Feb. 5, 1980, in turn a continuation-in-partof application Ser. No. 821,927 filed Aug. 4, 1977, now U.S. Pat. No.4,168,378 issued Sept. 18, 1979, in turn a continuation-in-part ofapplication Ser. No. 755,183 filed Dec. 29, 1976 and now abandoned.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a group of compounds classified in the fieldor organic chemistry as 3-[4-(disubstituted amino)phenyl] or(9-julolidinyl)-3-(diphenylamino)phthalides useful in the art ofcarbonless duplicating as color formers in pressure-sensitive andthermal marking systems; to processes for the preparation thereof; andto pressure-sensitive duplicating systems and thermal marking systemscontaining the same.

2. Description of the Prior Art

Several classes of organic compounds of widely diverse structural typesare known to be useful as color formers for carbonless duplicatingsystems. Among the more widely recognized classes, there may be namedphenothiazines, for example, benzoyl leuco methylene blue; fluorans, forexample, 2'-anilino-6'-diethylaminofluoran; phthalides, the class withwhich this invention is concerned, for example, crystal violet lactone;and various other types of color formers currently employed incommercially accepted carbonless duplicating systems. Typical of themany such systems taught in the prior art are those described in U.S.Pat. Nos. 2,712,507, 2,800,457 and 3,041,289 which issued July 5, 1955and June 26, 1957 and June 26, 1962, respectively. Many of the colorformers in the prior art suffer one or more disadvantages such as lowtinctorial strength, poor light stability, low resistance to sublimationand low solubility in common organic solvents, the latter disadvantagethus requiring the use of specialized and expensive solvents in order toobtain microencapsulated solutions of sufficient concentration for usein pressure-sensitive copying systems.

The following appear to constitute the most relevant prior art relativeto the present invention.

Japanese Patent Publication No. 71/4616 published Feb. 4, 1971 disclosesa series of compounds having the formula ##STR1## wherein R₁ is hydrogenor lower-alkyl; R₂ is hydrogen, halogen or lower-alkyl; and R₃ and R₄are each lower-alkyl. The compounds are prepared by reaction of a2-[4'-(dialkylamino)benzoyl]benzoic acid with an appropriate aniline,and are stated to be useful as color formers in pressure-sensitivecopying paper.

R. Valters and V. Tsiekure in Khim. Geterotsikl. Soedin. 1975, (11)1476-8 discuss ring-chain tautomerism in3-(N,N-diphenylamino)-3-phenylphthalide but disclose no utility for thecompound.

3. Patent Activities of Others

German Offenlegungsschrift No. 2,537,776 published Mar. 11, 1976, basedon Japanese Application No. 97934-74 published Mar. 2, 1976 as JapanesePatent Publication No. 76/25529, discloses in most pertinent part aseries of phthalides stated to be useful as color formers and having theformula: ##STR2## wherein inter alia R₁ and R₂ are the same or differentand are lower-alkyl, a benzyl group which can be substituted in itsaromatic ring with a di-lower-alkylamino group having 1 to 4 carbonatoms in its alkyl portions; or a phenyl group which can be substitutedwith a lower-alkoxy group with 1 to 4 carbon atoms; R₃ is a chlorineatom, a lower-alkyl group with 1 to 4 carbon atoms or a lower-alkoxygroup with 1 to 4 carbon atoms; R₄ is hydrogen or a lower-alkyl groupwith 1 to 4 carbon atoms; R₅ is a phenyl group which can be substitutedwith a lower-alkyl group of 1 to 4 carbon atoms or a chlorine atom.

SUMMARY OF THE INVENTION

The present invention provides novel 3-[4-(disubstitutedamino] or(9-julolidinyl)-3-(diphenylamino)phthalides useful as color formers inpressure-sensitive duplicating systems and thermal marking systems. Thecompounds develop colored images of good to excellent tinctorialstrength, and have the advantages of improved light stability, highresistance to sublimation and enhanced solubility in common organicsolvents.

In a composition-of-matter aspect the invention relates to a series of3-(2-R₁ -4-NR₂ R₃ -phenyl) or (9-julolidinyl)-3-[N-(Y₁ -Y₂-phenyl)-N-(Y₃ -Y₄ -phenyl)amino]-4-Q₄ -5-Q₅ -6-Q₆ -7-Q₇ -phthalideswhich are useful as color formers in pressure-sensitive carbonlessduplicating systems or thermal marking systems.

In a process aspect the present invention provides a process forpreparing 3-(2-R₁ -4-NR₂ R₃ -phenyl) or (9-julolidinyl)-3-[N-(Y₁ -Y₂-phenyl)-N-(Y₃ -Y₄ -phenyl)amino]-4-Q₄ -5-Q₅ -6-Q₆ -7-Q₇ -phthalideswhich comprises reacting a 2-(2-R₁ -4-NR₂ R₃ -benzoyl) or(9-julolidinylcarbonyl)-4-Q₄ -5-Q₅ -6-Q₆ -7-Q₇ -benzoic acid with aN-(Y₁ -Y₂ -phenyl)-N-(Y₃ -Y₄ -phenyl)amine.

This invention further provides a second process for preparing 3-(2-R₁-4-NR₂ R₃ -phenyl) or (9-julolidinyl)-3-[N-(Y₁ -Y₂ -phenyl)-N-(Y₃ -Y₄-phenyl)amino]-4-Q₄ -5-Q₅ -6-Q₆ -7-Q₇ -phthalides which comprisesreacting a 2-(2-R₁ -4-NR₂ R₃ -benzoyl) or (9-julolidinylcarbonyl)-4-Q₄-5-Q₅ -6-Q₆ -7-Q₇ -benzoic acid with an inorganic acid chloride followedby reaction of the product so-obtained with a N-(Y₁ -Y₂ -phenyl)-N-(Y₃-Y₄ -phenyl)amine.

In an article-of-manufacture aspect the present invention relates to apressure-sensitive carbonless duplicating system or thermal markingsystem containing a color-forming substance comprising a 3-(2-R₁ -4-NR₂R₃ -phenyl) or (9-julolidinyl)-3-[N-(Y₁ -Y₂ -phenyl)-N-(Y₃ -Y₄-phenyl)amino]-4-Q₄ -5-Q₅ -6-Q₆ -7-Q₇ -phthalide.

DETAILED DESCRIPTION INCLUSIVE OF THE PREFERRED EMBODIMENTS

More specifically, this invention in a composition-of-matter aspectresides in a compound having Formula I ##STR3## wherein: Q₄ is hydrogenor halo;

Q₅ is the same as Q₄ ; or di-lower-alkylamino, COX or halo when Q₄, Q₆and Q₇ are each hydrogen;

Q₆ is the same as Q₄ ; or di-lower-alkylamino, COX or halo when Q₄, Q₅and Q₇ are each hydrogen;

Q₇ is the same as Q₄ ;

X is hydroxy, benzyloxy, alkoxy having from 1 to 18 carbon atoms or OMwhere M is an alkali metal cation, an ammonium cation or a mono-, di- ortrialkylammonium cation having from 1 to 18 carbon atoms;

Y₁, Y₂, Y₃ and Y₄ are the same or different and are selected from thegroup consisting of hydrogen, halo, hydroxyl, lower-alkoxy, alkyl havingfrom 1 to 9 carbon atoms, phenyl-lower-alkyl, COOR₄ and NR₅ R₆ where R₄and R₅ are hydrogen or lower alkyl and R₆ is hydrogen, lower alkyl,cycloalkyl having from 5 to 7 carbon atoms, lower alkanoyl,phenylsulfonyl or lower-alkyl-substituted phenylsulfonyl;

Z is selected from the group consisting of 9-julolidinyl and a radicalhaving the formula ##STR4## in which: R₁ is selected from the groupconsisting of hydrogen, halo, lower-alkyl, lower-alkoxy anddi-lower-alkylamino;

R₂ is lower-alkyl; and

R₃ is selected from the group consisting of lower-alkyl, benzyl, phenyl,and phenyl substituted with a lower-alkyl or lower-alkoxy group.

The compounds are useful as color formers in pressure-sensitivecarbonless duplicating systems and in thermal-marking systems.

A particular embodiment sought to be patented resides in a compoundhaving Formula II ##STR5## wherein R₁, R₂, R₃, Q₄, Q₅, Q₆, Q₇, Y₁, Y₂,Y₃ and Y₄ have the previously given meanings. Preferred compounds withinthe ambit of this particular embodiment are those wherein:

(a) Q₄, Q₅, Q₆ and Q₇ are each hydrogen;

(b) Q₄, Q₅ and Q₇ are each hydrogen and Q is di-lower-alkylamino; and

(c) Q₄, Q₅, Q₆ and Q₇ are each halo, especially:3-[4-(dimethylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]-phthalide;3-[4-(dimethylamino)phenyl]-3-[(4-(isopropoxyphenyl)-phenylamino]phthalide;4,5,6,7-tetrachloro-3-[4-(dimethylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalide;3-[4-(diethylamino)-2-methylphenyl]3-[(4-ethoxyphenyl)phenylamino]-phthalide;3-[4-(dimethylamino)phenyl]-3-[bis(4-octylphenyl)-amino]phthalide;6-(dimethylamino)-3-[4-(dimethylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalide;3-[4-(dimethylamino)-phenyl]-3-(diphenylamino)phthalide;6-(dimethylamino)-3-[4-dimethylamino)phenyl]-3-[bis(4-octylphenyl)amino]phthalide;3-[4-(ethylbenzylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalideand3-[4-(diethylamino)-2-methylphenyl]-3-{bis[4-(dimethylamino)phenyl]amino}phthalide.

In one of its process aspects the invention sought to be patentedresides in the process which comprises reacting a 2-substituted benzoicacid having Formula III ##STR6## with a diarylamine having Formula IV##STR7## in the presence of the anhydride of an alkanoic acid havingfrom 2 to 5 carbon atoms, and an organic base; where in Formulas III andIV, Z, Q₄, Q₇, Y₁, Y₂, Y₃ and Y₄ have the previously given meanings; Q₅is the same as Q₄ ; or di-lower-alkylamino, halo or COX when Q₄, Q₆ andQ₇ are hydrogen; Q₆ is the same as Q₄ ; or di-lower-alkylamino, halo orCOX when Q₄, Q₅ and Q₇ are hydrogen; and X is hydroxy, benzyloxy oralkoxy having from 1 to 18 carbon atoms.

In another process aspect the invention sought to be patented resides inthe process which comprises reacting a 2-substituted benzoic acid ofFormula III with an inorganic acid chloride selected from the groupconsisting of thionyl, chloride, phosphorus oxychloride, phosphorustrichloride and phosphorus pentachloride followed by reaction of theresulting product with a diarylamine of Formula IV in the presence of anorganic base; where in Formulas III and IV, Z, Q₄, Q₅, Q₆, Q₇, Y₁, Y₂,Y₃ and Y₄ have the meanings given in the preceding paragraph.

In an article-of-manufacture aspect the invention sought to be patentedresides in a pressure-sensitive carbonless duplicating system or thermalmarking system containing a color-forming substance comprising acompound having Formula I.

A particular embodiment sought to be patented resides in apressure-sensitive transfer sheet, adapted for use with a receivingsheet having an electron accepting layer, comprising a support sheetcoated on one side with a layer of pressure-rupturable microcapsules,said microcapsules containing a liquid solution of a color formingsubstance comprising at least one compound having Formula I.

Another particular embodiment sought to be patented resides in a heatresponsive record material comprising a support sheet coated on one sidewith a layer containing a mixture comprising at least one color-formingcompound having Formula I and an acidic developer arranged such thatapplication of heat will produce a mark-forming reaction between thecolor-forming compound and the acidic developer.

Preferred articles within the ambit of the particular embodimentsabove-described are those wherein the color-forming component comprisesa compound having Formula II, especially where in Formula II:

(a) Q₄, Q₅, Q₆ and Q₇ are each hydrogen;

(b) Q₄, Q₅ and Q₇ are each hydrogen and Q₆ is di-lower-alkylamino, and

(c) Q₄, Q₅, Q₆ and Q₇ are each halo.

As used herein the term "halo" includes chloro, fluoro, bromo and iodo.Chloro is the preferred hal substituent because of the relatively lowcost and ease of preparation of the required chloro-substitutedintermediates and because the other halogens offer no particularadvantages over chloro. However the other above-named halo substituentsare also satisfactory.

The terms "lower-alkyl, lower-alkoxy and di-lower-alkylamino" denotesaturated, acyclic groups having from 1 to 4 carbon atoms which may bestraight or branched as exemplified by methyl, ethyl, propyl, isopropyl,butyl, sec-butyl, isobutyl, tert-butyl, methoxy, ethoxy, propoxy,isopropoxy, butoxy, sec-butoxy, isobutoxy, tert-butoxy, dimethylamino,diethylamino, ethylmethylamino, dipropylamino, dibutylamino,isobutylmethylamino, di-tert-butylamino and the like.

As used herein the term "alkyl of one to nine carbon atoms" denotessaturated monovalent straight or branched chain aliphatic hydrocarbonradicals including methyl, ethyl, propyl, isopropyl, butyl, isobutyl,tert-butyl, amyl, 1-methylbutyl, 3-methylbutyl, hexyl, isohexyl, heptyl,isoheptyl, octyl, isooctyl, 2-ethylhexyl, nonyl, 3-ethylheptyl and thelike.

As used herein the term "cycloalkyl having from 5 to 7 carbon atoms"includes cyclopentyl, cyclohexyl and cycloheptyl.

The term "lower alkanoyl" denotes saturated acyclic acyl groups havingfrom 1 to 5 carbon atoms which may be straight or branched asexemplified by formyl, acetyl propionyl, butyryl, isobutyryl, valeryl,2-methylbutyryl, isovaleryl, pivalyl and the like.

The term "phenyl-lower-alkyl includes benzyl, 2-phenylethyl,2-phenylpropyl, 3-phenylpropyl, 1-phenylbutyl,2,2-dimethyl-2-phenylethyl and the like. If desired the phenyl group maycontain a lower alkyl or lower alkoxy substituent.

The term "alkoxy having from 1 to 18 carbon atoms" includes, in additionto the above-noted lower-alkoxy groups, saturated, acyclic, straight orbranched-chain groups such as n-pentyloxy, n-hexyloxy, n-heptyloxy,n-octyloxy, n-nonyloxy, n-decyloxy, n-undecyloxy, n-dodecyloxy,n-tridecyloxy, n-tetradecyloxy, n-pentadecyloxy, n-hexadecyloxy,n-heptadecyloxy, n-octadecyloxy, 1-methylpentyloxy,2,2-dimethylbutyloxy, 2-methylhexyloxy, 1,4-dimethylpentyloxy,3-ethylpentyloxy, 2-methylheptyloxy, 1-ethylhexyloxy, 2-propylpentyloxy,2-methyl-3-ethylpentyloxy, 1,3,5-trimethylhexyloxy,1,5-dimethyl-4-ethylhexyloxy, 5-methyl-2-butylhexyloxy-2-propylnonyloxy,2-butyloctyloxy, 1,1-dimethylundecyloxy, 2-pentylnonyloxy,1,2-dimethyltetradecyloxy, 1,1-dimethylpentadecyloxy and the like.

As used herein the term "alkali metal" includes lithium, sodium andpotassium.

The term "mono-, di- or tri-alkylammonium cation" includes ammoniumcations substituted by from 1 to 3 alkyl groups as above described. Thealkyl groups can be the same or different provided the ammonium cationcontains no more than 18 carbon atoms. As examples there can be namedmethylammonium, t-butylammonium, t-octylammonium, n-dodecylammonium,n-octadecylammonium, di-n-butylammonium, di-n-nonylammonium,isopropyl-n-butylammonium, dimethyl-n-butylammonium, triethylammonium,N-ethyl-N,N-diisopropylammonium, tributylammonium,di-n-butyl-n-octylammonium and the like.

The term "9-julolidinyl" of course refers to the radical having FormulaV ##STR8##

Anhydrides of alkanoic acids of two to five carbon atoms include aceticanhydride, propionic anhydride, butyric anhydride, isobutyric anhydride,valeric anhydride, isovaleric anhydride, α-methylbutyric anhydride,pivalic anhydride and the like. Acetic anhydride is preferred because ofits low cost and high reactivity, however the other above-namedanhydrides are also satisfactory.

Organic bases include pyridine, collidine, tri-lower-alkyl amines, urea,diarylamines of Formula IV hereinabove and the like. Because of theirlow cost and ready availability pyridine and urea are preferred.

In accordance with one of the process aspects of this invention thecompounds having Formula I are obtained by reacting approximatelyequimolar amounts of a 2-substituted benzoic acid of Formula III and adiarylamine of Formula IV in the anhydride of an alkanoic acid havingfrom two to five carbon atoms, such as acetic anhydride, with or withoutan inert diluent and in the presence of an organic base, for examplepyridine or urea, at a temperature of from 0° to100° C. for fromapproximately 10 minutes to 24 hours. The reaction is usually carriedout in the absence of an inert diluent at about 20° to 40° C. forapproximately 0.5 to 2 hours. If desired an excess of the diarylaminereactant can be employed as the organic base. The product thus obtainedcan be isolated by filtration if it is insoluble in the reaction mediumor by dilution of the reaction medium with a miscible solvent in whichthe product is insoluble such as a lower-alkanol or low molecular weighthydrocarbon for example isopropyl alcohol or hexane or a mixture ofthese in order to effect precipitation of the product. Alternatively,the reaction mixture can be poured into aqueous base such as diluteammonium hydroxide, sodium hydroxide, sodium carbonate or sodiumbicarbonate and the product extracted with an organic solvent such asbenzene or toluene followed by evaporation of the organic solventleaving the product as a residue. The product once isolated can bepurified by conventional means such as trituration or recrystallizationfrom a suitable solvent.

In accordance with a second process aspect of the invention thecompounds of Formula I can be prepared in two steps which comprise firstreacting a 2-substituted benzoic acid of Formula III with an excess ofan inorganic acid chloride such as thionyl chloride, phosphorusoxychloride, phosphorus trichloride or phosphorus pentachloride with orwithout in inert diluent such as benzene, toluene, chloroform or1,2-dichloroethane, at 20° to 80° C. for about 0.5 to 2 hours; andfollowing removal of excess inorganic acid chloride, reaction of theresulting product which while not having been isolated is presumed to bea halide having Formula VI ##STR9## in which Q₄, Q₅, Q₆, Q₇ and Z havethe meanings previously given in Formula III, with a diarylamine ofFormula IV hereinabove in an inert solvent in the presence of an organicbase as previously described at a temperature in the range of 0° to 80°C. for about 1 to 48 hours. The product can be isolated and purified inthe manner previously described.

When preparing compounds of Formula I wherein Q₅ or Q₆ is COX and X isbenzyloxy, alkoxy having from 1 to 18 carbon atoms or OM where M is analkali metal cation, an ammonium cation or a mono, di ortrialkylammonium cation having from 1 to 18 carbon atoms it isordinarily preferred to first prepare the compound of Formula I whereinQ₅ or Q₆ is COOH followed by conversion of the carboxyl group to thedesired ester, alkali metal salt or ammonium salt in accordance withconventional procedures.

The 2-substituted benzoic acids of Formula III required as startingmaterials in the preparation of the products of Formula I are generallyknown or if specifically new can be prepared in accordance with theprocedures described for the preparation of the known compounds, forexample as disclosed in British Pat. No. 1,435,179, published May 12,1976, i.e., by reacting a phthalic anhydride having Formula VII##STR10## with julolidine or an appropriate aniline having Formula VIII##STR11## under Friedel-Crafts conditions, where in Formula VII Q₄, Q₅,Q₆ and Q₇ have the meanings given above in Formula III, and in FormulaVIII R₁, R₂ and R₃ have the previously given meanings. It will, ofcourse, be appreciated that when Q₅ (or Q₆) of the phthalic anhydride(Formula VII) is halo, COX or di-lower-alkylamino the reaction canproduce isomers or a mixture of isomers, viz. 2-substituted benzoicacids of Formula III having a halo, COX or di-lower-alkylaminosubstituent at the 4-position (Q₅) or the 5-position (Q₆) or a mixtureof these. In the latter instance the isomeric 2-substituted benzoicacids can be separated by conventional means such as fractionalcrystallization or chromatography. Alternatively, the mixture of2-substituted benzoic acids can be reacted with a diarylamine of FormulaIV to produce a mixture of 5 and 6- substituted phthalides of Formula Iwhich, if desired, can be separated or simply used as the mixture in thepractice of this invention.

The diarylamines of Formula IV which are also required as startingmaterials in the processes of the invention belong to a well known classof compounds and are either commercially available or readily obtainedby conventional procedures well known in the art.

The novel compounds of Formula I hereinabove are essentially colorlessin the depicted form. When contacted with an acidic medium, for examplesilica gel or one of the types ordinarily employed in pressure-sensitivecarbonless duplicating systems such as silton clay or phenolic resinsthe compounds of Formula I develop a yellow to black colored image ofgood to excellent tinctorial strength, and possessing excellent lightstability, resistance to sublimation and xerographic copiability. Thecompounds are thus highly suitable for use as colorless precursors, thatis color-forming substances in pressure-sensitive carbonless duplicatingsystems. The compounds which produce a yellow to red color can be usedas toners in admixture with other color formers to produce images of aneutral shade which desirably are readily copiable by xerographic means.The compounds of Formula I wherein at least one of Y₁ and Y₂ and atleast one of Y₃ and Y₄ are simultaneously di-lower-alkylamino develop apurple to black image when contacted with an acidic medium and areaccordingly of particular value as color precursors. Moreover, thecompounds of Formula I, in particular whose wherein Q₅ or Q₆ is COX andX is alkoxy having from 1 to 18 carbon atoms, or those wherein one ormore of Y₁, Y₂ Y₃ and Y₄ are alkyl of 1 to 9 carbon atoms, have enhancedsolubility in common and inexpensive organic solvents such as odorlessmineral spirits, kerosene, vegetable oils and the like; and thosewherein Q₅ or Q₆ is COX and X is OM in which M has the previously givenmeaning are soluable in water and lower-alkanols thereby avoiding theneed for more expensive, specialized solvents such as polyhalogenated oralkylated biphenyls which have ordinarily been used to preparemicroencapsulated solutions of the color formers of the prior art.

The compounds of this invention may be incorporated in any of thecommercially accepted systems known in the carbonless duplicating art. Atypical technique for such application is as follows. Solutionscontaining one or more colorless precursor compounds of Formula I,optionally in admixture with other color formers, in suitable solventsare microencapsulated by well-known procedures for example as describedin U.S. Pat. No. 3,649,649. The microcapsules are coated on the reverseside of a transfer sheet with the aid of a suitable binder and thecoated transfer sheet is then assembled in a manifold with themicrocapsule coated side in contact with a receiving sheet coated withan electron accepting substance, for example, silton clay or a phenolicresin. Application of pressure to the manifold such as that exerted by astylus, typewriter or other form of writing or printing causes thecapsules on the reverse side to rupture. The solution of the colorformer released from the ruptured microcapsules flows to the receivingsheet and on contact with the acidic medium thereon forms a yellow tored colored image of good tinctorial strength. It is, of course, obviousthat variants of this mode of application can be utilized. For example,the receiving sheet in a manifold can alternatively be coated with thesubject compounds and the acidic developing agent can be contained inmicrocapsules applied to the reverse side of the top sheet in themanifold; or the receiving sheet can be coated with a mixture containingboth the acidic developing agent and the microencapsulated color former.

It has also been found that when the compounds of Formula I areintimately mixed with an acidic developer of the type generally employedin thermal papers such as described in U.S. Pat. No. 3,539,375, that is,papers which produce a colored image when contacted with a heated stylusor heated type, for example, bisphenol A. heating of the mixtureproduces a colored image of varying shades from yellow to purpledepending on the particular compound of the invention employed. Theability of the compounds of Formula I to form a deep color when heatedin admixture with an acidic developer such as bisphenol A, makes themuseful in thermal paper marking systems, either where an original or aduplicate copy is prepared by contacting the thermal paper with a heatedstylus or heated type in any of the methods generally known in the art.

The compounds of this invention which are soluble in water andlower-alkanols may be incorporated in any of the commercial hectographicor spirit-reproducing copying systems such as described in British Pat.No. 1,427,318 published Mar. 10, 1976. In such systems a transfer sheetcoated on one side with a layer containing one or more water- or loweralkanol-soluble color formers of Formula I is placed with its coatedsurface against one surface of a master paper which is then typed,written or marked on, causing transfer of the coating as a substantiallycolorless reverse image to the master paper at the points where thetransfer sheet and master paper have been pressed together. The masterpaper is then brought into contact with a succession of sheets of papermoistened with a suitable spirit-reproducing fluid such as ethanol.

The molecular structures of the compounds of this invention wereassigned on the basis of the modes of synthesis, elemental analysis andstudy of their infrared, nuclear magnetic resonance, and mass spectra.

The following examples will further illustrate the invention without,however, limiting it thereto.

EXAMPLE 1

A mixture containing 5.4 g. of 2-[4-(dimethylamino)-benzoyl]benzoicacid, 3.4 g. of diphenylamine, 2 ml. of pyridine and 15 ml. of aceticanhydride was stirred at room temperature. After a few minutes the solidreactants were completely dissolved and after 15 minutes an orange solidprecipitated. The reaction mixture was stirred an additional 15 minutesand then diluted with 20 ml. of 2-propanol and 50 ml. of ligroin. Afterstirring an additional 10 minutes the solids were collected, washed withligroin and 2-propanol (which removed an orange impurity) and dried togive 5.9 g. of 3-[4-(dimethylamino)phenyl]-3-(diphenylamino)phthalide asa cream solid, m.p. 188°-190° C. (dec.). A toluene solution of theproduct contacted with acidic clay or phenolic resin developed an orangecolored image.

EXAMPLE 2

A mixture containing 5.4 g. of 2-[4-(dimethylamino)- benzoyl]benzoicacid, 4.3 g. of 4-ethoxy-N-phenylaniline, 0.5 g. of urea and 15 ml. ofacetic anhydride was stirred 0.5 hr. at room temperature. Completedissolution of the solid reactants was followed shortly by precipitationof the product. After diluting the reaction mixture with 20 ml. of2-propanol the product was collected, washed with 2-propanol and driedto give 8.4 g. of 3-[4-(dimethylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalide as a white solid, m.p. 214°-216° C. (dec.). Atoluene solution of the product contacted with acidic clay or phenolicresin developed an orange colored image.

EXAMPLE 3

A mixture containing 6.24 g. (0.02 mole) of5-(dimethylamino)-2-[4-(dimethylamino)benzoyl]benzoic acid, 6.25 g.(0.03 mole) of 4-ethoxy-N-phenylaniline and 20 ml. of acetic anhydridewas stirred at room temperature for 20 hours. The reaction mixture wasthen diluted with 30 ml. of 2-propanol and stirred an additional 0.5 hr.The solids were collected, washed with ligroin and dried to give 9.3 g.of6-(dimethylamino)-3-[4-(dimethylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalideas a pale pink solid, m.p. 200°-202° C. (dec.). A toluene solution ofthe product contacted with acidic clay or phenolic resin developed anorange colored image, which, on acidic clay, became green after exposureto fluoroecent light

EXAMPLE 4

A mixture containing 2.0 g. of 2[2,4-bis(dimethylamino)benzoyl]benzoicacid, 1.4 g. of 4-ethoxy-N-phenylaniline, 1 ml. of pyridine and 8 ml. ofacetic anhydride was stirred 1.5 hrs. at room temperature. Dilution with20 ml. of 2-propanol and 50 ml. of ligroin produced no precipitate. Thereaction mixture was therefore poured into 10% aqueous ammonia and theproduct was extracted with toluene. The organic extracts were washedwith water and saturated aqueous sodium chloride and evaporated todryness under vacuum. Trituration of the residue with ligroin afforded2.18 g. of3-[2,4-bis-(dimethylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]-phthalideas a pale orange solid, m.p. 111°-117° C. (dec.). A toluene solution ofthe product contacted with acidic clay or phenolic resin developed anorange colored image.

EXAMPLE 5

A mixture containing 1.7 g. of3,4,5,6-tetrachloro-2-[4-(dimethylamino)benzoyl]benzoic acid, 0.5 ml. ofthionyl chloride and 200 ml. 1,2-dichloroethane was heated 0.5 hr. underreflux to produce a pale green solution. After cooling to 35° C. asolution containing 1.0 g. of 4-ethoxy-N-phenylaniline and a few dropsof pyridine in 10 ml. of 1,2-dichloroethane was added and stirring atroom temperature was continued for 2 days. The reaction mixture was thenpoured into 10% aqueous ammonia and the product extracted with1,2-dichloroethane. The organic extracts were washed with water andsaturated aqueous sodium chloride and evaporated to dryness undervacuum. The residue was slurried in 100 ml. of acetone and a whitewater-soluble solid was filtered off. The filtrate was evaporated todryness and the residue was triturated with 2-propanol to give 1.5 g. ofcrude 4,5,6,7-tetrachloro-3-[4-(dimethylamino)phenyl]-3-[(4-ethoxyphenyl)-phenylamino]phthalide as a gray solid, m.p. 112° -121° C. The nmrspectrum indicated the product to be a mixture containing the desiredphthalide and unreacted3,4,5,6-tetrachloro-2-[4-(dimethylamino)benzoyl]benzoic acid in anapproximate ratio of 60:40. A toluene solution of the product contactedwith acidic clay developed a brown colored image; and when contactedwith phenolic resin produced a pinkish-purple colored image.

EXAMPLE 6

Following a procedure similar to that described in Example 1 butemploying 6.24 g. of5-(dimethylamino)-2-[4-(dimethylamino)benozoyl]benzoic acid and 3.4 g.of diphenylamine there was obtained 8.67 g.6-(dimethylamino)-3-[4-(dimethylamino)phenyl]-3-(diphenylamino)phthalide,m.p. 159°-160° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed a red color image which, onacidic clay, became green after exposure to fluoroescent light.

EXAMPLE 7

Following a procedure similar to that described in Example 1 butemploying 3.1 g. of 2-[4-(diethylamino)-2-methylbenzoyl]benzoic acid and2.1 g. of 4-ethoxy-N-phenylaniline there was obtained 3.7 g. of3-[4-(diethylamino)-2-methylphenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalide,m.p. 176°-178° C. (dec.). A toluene solution of the product contactedwith acidic clay or phenolic resin developed a red colored image.

EXAMPLE 8

Following a procedure similar to that described in Example 1 butemploying 2.7 g. of 2-[4-(dimethylamino)benzoyl]-benzoic acid and 1.9 g.of 3-methyl-N-phenylaniline there was obtained 2.7 g. of3-[4-(dimethylamino)phenyl]-3-[(3-methylphenyl)phenylamino]phthalide,m.p. 185°-187° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed an orange colored image.

EXAMPLE 9

Following a procedure similar to that described in Example 1 butemploying 2.7 g. of 2-[4-(dimethylamino)benzoyl]-benzoic acid and 2.5 g.of 4-isopropoxy-N-phenylaniline there was obtained 4.34 g. of3-[4-(dimethylamino)phenyl]-3-[(4-isopropoxyphenyl)phenylamino]phthalide,m.p. 181°-184° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed an orange colored image.

EXAMPLE 10

Following a procedure similar to that described in Example 1 butemploying 3.1 g. 2-[4-(diethylamino)-2-methyl)-benzoyl]benzoic acid and2.5 g. of 4-isopropoxy-N-phenylaniline there was obtained 3.9 g. of3-[4-(diethylamino)-2-methylphenyl]-3[(4-isopropoxyphenyl)phenylamino]phthalide,m.p. 176°-178° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed a red colored image.

EXAMPLE 11

Following a procedure similar to that described in Example 1 butemploying 3.61 g. of 2[4-(N-p-anisoyl-N-methylamino)benzoyl]benzoic acid(m.p. 235°-242° C.) and 2.13 g. of 4-ethoxy-N-phenylaniline there wasobtained 1.88 g. of3-[4-(N-p-anisoyl-N-methylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalide,m.p. 63°-68° C. (dec.). A toluene solution of the product contacted withacidic clay or phenolic resin developed an orange colored image.

EXAMPLE 12

Following a procedure similar to that described in Example 1 butemploying 3.21 g. of 2-(9-julolidinylcarbonyl)-benzoic acid and 2.13 g.of 4-ethoxy-N-phenylaniline there was obtained 4.61 g. of3-(9-julolidinyl)-3-[(4-ethoxyphenyl)phenylamino]phthalide, m.p.143°-147° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a red colored image.

EXAMPLE 13

Following a procedure similar to that described in Example 4 butemploying 5.4 g. of 2-[4-(dimethylamino)benzoyl]-benzoic acid and 4.0 g.of 4-hydroxy-N-phenylaniline there was obtained 5.6 g. of3-[4-dimethylamino)phenyl]-3-[(4-hydroxyphenyl)phenylamino]phthalide,m.p. 81°-95° C. (dec.). A toluene solution of the product contacted withacidic clay or phenolic resin developed an orange colored image.

EXAMPLE 14

Following a procedure similar to that described in Example 4 butemploying 1.4 g. of 2-[4-(diethylamino)-2-methylbenzoyl]benzoic acid and0.9 g. of diphenylamine there was obtained 1.36 g. of3-[4-(diethylamino)-2-methylphenyl]-3-(diphenylamino)-phthalide, m.p.173°-175° C. (dec.). A toluene solution of the product contacted withacidic clay or phenolic resin developed a red colored image.

EXAMPLE 15

Following a procedure similar to that described in Example 4 butemploying 3.1 g. of 2-[4-(diethylamino)-2-methylbenzoyl]benzoic acid and2.1 g. of 3-methyl-N-phenylaniline there was obtained 1.2 g. of3-[4-(diethylamino)-2-methylphenyl]-3-[(3-methylphenyl)phenylamino]phthalide,m.p. 155°-156° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed a red colored image.

EXAMPLE 16

Following a procedure similar to that described in Example 4 butemploying 1.0 g. of 2-[4-(dimethylamino)-benzoyl]-benzoic acid and 1.4g. of 4,4'-dioctyldiphenylamine there was obtained 0.62 of3-[4-(dimethylamino)phenyl]-3-[bis(4-octylphenyl)-amino]phthalide, m.p.158°-169° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed an orange colored image. In anotherpreparation carried out in a manner similar to that described in Example2 the product was obtained as a solid, m.p. 163°-167° C.

A 2 percent (W/V) toluene solution of the product of this example wasmixed in varying proportions with a 2 percent (W/V) toluene solution ofthe known color former crystal violet lactone (CVL) and the resultingsolution was contacted with phenolic resin with the following results.

    ______________________________________                                        Cpd. of Ex. 16                                                                           CVL                                                                (2% solution)                                                                            (2% solution)                                                                             color of image produced                                ______________________________________                                        7.0 ml.    3.0 ml.     brownish violet black                                  6.5 ml.    3.5 ml.     brownish violet black                                  6.0 ml.    4.0 ml.     violet black                                           5.0 ml.    5.0 ml.     bluish black                                           ______________________________________                                    

EXAMPLE 17

Following a procedure similar to that described in Example 4 butemploying 3.1 g. of 2-[4-(diethylamino)-2-methylbenzoyl]benzoic acid and4.0 g. of 4,4'-dioctyldiphenylamine there was obtained 0.41 g. of3-[4-(diethylamino)-2-methylphenyl]-3-[bis(4-octylphenyl)amino]phthalide,m.p. 85°-110° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a red colored image. Anotherpreparation carried out in a manner similar to that described in Example1 afforded a product m.p. 176°-179° C.

EXAMPLE 18

Following a procedure similar to that described in Example 4 butemploying 2.7 g. of 2-[4-(diethylamino)benzoyl]benzoic acid and 5 g. of3,3'-diethyl-5,5'-dinonyldiphenylamine there was obtained crude3-[4-(dimethylamino)phenyl]-3-[bis(3-ethyl-5-nonylphenyl)amino]phthalide as a gum. A toluene solution ofthe product contacted with acidic clay or phenolic resin developed ayellow colored image.

EXAMPLE 19

Following a procedure similar to that described in Example 4 butemploying 6.1 g. of 2-[2-chloro-4-(dimethylamino)benzoyl] benzoic acidand 4.2 g. of 4-ethoxy-N-phenylaniline there was obtained crude3-[2-chloro-4-(dimethylamino)-phenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalideas a gum. A toluene solution of the product contacted with acidic clayor phenolic resin developed a red colored image.

EXAMPLE 20

Following a procedure similar to that described in Example 4 butemploying 2.7 g. of 2-[4-(dimethylamino)benzoyl]benzoic acid and 2.1 g.of 3-chloro-N-phenylamiline there was obtained 1.6 g. of3-[4-(dimethylamino)phenyl]-3-[(3-chlorophenyl)phenylamino]- phthalide,m.p. 128°-138° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed an orange colored image.

EXAMPLE 21

Following a procedure similar to that described in Example 1 butemploying 2.6 g of 2-[4-(dimethylamino)benzoyl]-benzoic acid and 2.1 gof 4-(dimethylamino)-N-phenylaniline there was obtained 2.2 g of3-[4-(dimethylamino)phenyl]-3-{[4-(dimethylamino)phenylamino}phthalide,m.p. 163°-166° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed a brown-colored image.

EXAMPLE 22

Following a procedure similar to that described in Example 1 butemploying 3.1 g. of5-(dimethylamino)-2-[4-(dimethylamino)benzoyl]benzoic acid and 3.0 g of4-(dimethylamino)-N-phenylaniline there was obtained 3.8 g of6-(dimethylamino)-3-[4-dimethylamino)phenyl]-3-{[4-(dimethylamino)phenyl]phenylamino}phthalide,m.p. 163°-164° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed a brown-colored image whichchanged to green on clay after fluorescent light exposure.

EXAMPLE 23

Following a procedure similar to that described in Example 1 butemploying 4.0 g of 2-[4-(diethylamino)-2-methyl)benzoyl]benzoic acid and4.0 g of 4-(dimethylamino)-N-phenylaniline there was obtained3-[4-diethylamino)-2-methylphenyl]-3-{[14-(dimethylamino)phenyl]phenylamino}phthalide, m.p. 154°-156° C. A toluenesolution of the product contacted with acidic clay or phenolic resindeveloped a dark grape-colored image.

EXAMPLE 24

Following a procedure similar to that described in Example 4 butemploying 2.6 g of 2-[4-(dimethylamino)benzoyl]- benzoic acid and 2.3 gof methyl 2-anilinobenzoate there was obtained 1.3 g of3-[4-(dimethylamino)phenyl]-3-{[2-(methoxycarbonyl)phenylphenylamino}phthalide, m.p. 92.5°-102° C. A toluene solution of theproduct contacted with acidic clay developed a yellow-colored image.

EXAMPLE 25

Following a procedure similar to that described in Example 4 butemploying 3.1 g of 2-[4-(diethylamino)-2-methyl)-benzoly]benzoic acidand 2.3 g of methyl 2-anilinobenzoate there was obtained 1.4 g of3-[4-(diethylamino)-2-methylphenyl]-3-{[2-(methoxycarbonyl)phenyl]phenylamino}phthalide,m.p. 51°-126° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed an orange-colored image.

EXAMPLE 26

Following a procedure similar to that described in Example 4 employing5.2 g of 2-[4-(dimethylamino)benzoyl[ benzoic acid and 7.0 g of4,4'-bis-(dimethylamino)diphenylamine there was obtained 10.7 g of3-[4-(dimethylamino)phenyl]-3-{bis[4-(dimethylamino)phenyl]amino}phthalide,m.p. 67°-143° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a brown-colored image.

EXAMPLE 27

Following a procedure similar to that described in Example 1 butemploying 4.0 g of 2-[4-(dimethylamino)benzoyl]benzoic acid and 3.4 g of4-acetamido-N-phenylaniline there was obtained 5.9 g. of3-[4-(dimethylamino)phenyl]-3-[N-(4-acetamidophenyl)phenylamin]phthalide,m.p. 182°-184.5° C. An acetone solution of the product contacted withacidic clay or phenolic resin developed an orange-colored image.

Example 28

Following a procedure similar to that described in Example 1 butemploying 4.6 g of 2-[4-(diethylamino)-2-methyl)benzoyl]benzoic acid and3.4 g of 4-acetamido-N-phenylaniline there was obtained 5.6 g of3-[4-(diethylamino)-2-methylphenyl]-3-[(4-acetamidophenyl)phenylamino]phthalide,m.p. 169°-171° C. An acetone solution of the product contacted withacidic clay or phenolic resin developed a red-colored image.

EXAMPLE 29

Following a procedure similar to that described in Example 4 butemploying 3.2 g of 2-[4-(diethylamino)-2-methyl)benzoyl]benzoic acid and2.9 g of 4,4'-diacetamidodiphenylamine there was obtained 0.82 g of3-[4-(diethylamino)-2-methylphenyl]-3-[bis(4-acetamidophenyl)amino]phthalide,m.p. 179°-182° C. An acetone solution of the product contacted withacidic clay or phenolic resin developed a red-colored image.

EXAMPLE 30

Following a procedure similar to that described in Example 4 butemploying 4.0 g of5-(dimethylamino)-2-[4-(ethylbenzylamino)benzoyl]benzoic acid and 2.2 gof 4-ethoxy-N-phenyl aniline there was obtained 3.0 g of6-(dimethylamino)-3-[4-(ethylbenzylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalide,m.p. 148°-152° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed an orange-colored image whichchanged to green on clay after fluorescent light exposure.

EXAMPLE 31

Following a procedure similar to that described in Example 2 butemploying 5.4 g of 2-[4-(ethylbenzylamino)benzoyl]-benzoic acid and 3.1g of 4-ethoxy-N-phenylaniline there was obtained 7.5 g of3-[4-(ethylbenzylamino)phenyl]-3-[(4-ethoxy-phenyl)phenylamino]phthalide,m.p. 163°-173° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed an orange-colored image.

EXAMPLE 32

Following a procedure similar to that described in Example 3 butemploying 3.2 g of 2-[4-(diethylamino)-2-methyl)-benzoyl]benzoic acidand 5 g of 4-octyl-4'-arylalkyldiphenylamine which is available from theB. F. Goodrich Chemical Company under the trade name Good-riteAntioxidant 3190 there was obtained3-[4-(diethylamino)-2-methylphenyl]-3-{(4-octylphenyl)[4-(arylalkyl)phenyl]amino}phthalideas an oil. A toluene solution of the product contacted with acidic clayor phenolic resin developed a red-colored image.

EXAMPLE 33

Following a procedure similar to that described in Example 1 butemploying 15.6 g of5-(dimethylamino)-2-[4-(dimethylamino)benzoyl]benzoic acid and 19.6 g of4,4'-dioctyldiphenylamine there was obtained 30.0 g of6-(dimethylamino)-3-[4-(dimethylamino)phenyl]-3-[bis(4-octylphenyl)amino]phthalide,m.p. 208°-210° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed an orange-colored image whichchanged to green on the clay after fluoroescent light exposure.

EXAMPLE 34

Following a procedure similar to that described in Example 4 butemploying 3.4 g of 2-[4-(diethylamino)-2-ethoxy)benzoyl]benzoic acid and4.0 g of 4,4'-dioctyldiphenylamine there was obtained3-[4-(diethylamino)-2-ethoxyphenyl]-3-[bis-(4-octylphenyl)amino]phthalideas an oil. A toluene solution of the product contacted with acidic clayor phenolic resin developed an orange-colored image.

EXAMPLE 35

Following a procedure similar to that described in Example 4 butemploying 5.1 g of 2-[4-(diethylamino)-2-ethoxy)-benzoyl]benzoic acidand 3.4 g of 4-acetamido-N-phenylaniline there was obtained 4.8 g of3-[4-(diethylamino)-2-ethoxyphenyl]-3-[(4-acetamidophenyl)phenylamino]phthalide,m.p. 126°-131° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed an orange-colored image.

EXAMPLE 36

Following a procedure similar to that described in Example 1 butemploying 5.7 g of 2-[4-(dimethylamino)-2-methylbenzoyl]benzoic acid and8.0 g of 4,4'-dioctyldiphenylamine there was obtained 6.2 g of3-[4-(dimethylamino)-2-methylphenyl]-3-[bis(4-octylphenyl)amino]phthalide,m.p. 172°-174° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed a red-colored image.

EXAMPLE 37

Following a procedure similar to that described in Example 4 butemploying 4.6 g of 2-[4-(diethylamino)-2-methyl)-benzoyl]benzoic acidand 4.5 g of 4,4'-bis-(diethylamino)diphenylamine there was obtained0.53 g of3-[4-(diethylamino)-2-methylphenyl]-3-{bis[4-(diethylamino)phenyl]amino}phthalide,m.p. 58°-71° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a black-colored image.

EXAMPLE 38

Following a procedure similar to that described in Example 4 butemploying 4.6 g of 2-[4-(diethylamino)-2-methyl)-benzoyl]benzoic acidand 5.0 g of 4-(diethylamino)-4'-(dimethylamino)diphenylamine there wasobtained 5.9 g of3-[4-(diethylamino)-2-methylphenyl]-3-{[4-(diethylamino)phenyl][4-(dimethylamino)phenyl]amino}phthalide,m.p. 68°-83° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a black-colored image.

EXAMPLE 39

Following a procedure similar to that described in Example 4 butemploying 4.5 g of 2-[4-(dimethylamino)-2-chloro)benzoyl]benzoic acidand 5.0 g of 4-(diethylamino)-4'-(dimethylamino)diphenylamine there wasobtained 0.8 g of3-[4-(dimethylamino)-2-chlorophenyl]-3-{[4-(diethylamino)phenyl][4-(dimethylamino)phenyl]amino}phthalide,m.p. 67°-84° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a black-colored image.

EXAMPLE 40

Following a procedure similar to that described in Example 4 butemploying 5.8 g of 2-[4-(diethylamino)-2-ethoxy)benzoyl]benzoic acid and3.9 g of 4,4'-bis(dimethylamino)diphenylamine there was obtained 2.26 gof3-[4-(diethylamino)-2-ethoxyphenyl]-3-{bis[4-(dimethylamino)phenyl]amino}phthalide,m.p. 58°-69° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a grapeblack-colored image.

EXAMPLE 41

Following a procedure similar to that described in Example 4 butemploying 5.7 g of 2-[4-(dimethylamino)-2-methyl)benzoyl]benzoic acidand 5.0 g of 4,4'-bis(dimethylamino)diphenylamine there was obtained0.22 g of 3-[4-(dimethylamino)-2-methylphenyl]-3-{bis[4-(dimethylamino)phenyl]amino}phthalide, m.p. 97°-113° C. A toluenesolution of the product contacted with acidic clay or phenolic resindeveloped a black-colored image.

EXAMPLE 42

Following a procedure similar to that described in Example 4 butemploying 5.7 g of 2-[4-(dimethylamino)-2-methylbenzoyl]benzoic acid and5.5 g of 4,4'-bis(diethylamino)diphenylamine there was obtained 1.62 gof3-[4-(dimethylamino)-2-methylphenyl]-3-{bis[4-(diethylamino)phenyl]amino}phthalide,m.p. 59°-72° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a black-colored image.

EXAMPLE 43 A.

Following a procedure similar to that described in Example 4 butemploying 3.1 g of 2-[4-(diethylamino)-2-methylbenzoyl]benzoic acid and3.0 g of 4,4'-bis(dimethylamino)diphenylamine there was obtained 2.95 gof3-[4-(diethylamino)-2-methylphenyl]-3-{bis[4-(dimethylamino)phenyl]amino}phthalide,m.p. 67°-83° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a black-colored image.

B.

A mixture containing 6.2 g of2-[4-(diethylamino)-2-methylbenzoyl]benzoic acid and 5.1 g of4,4'-bis(dimethylamino)diphenylamine, 20 ml of acetic anhydride and 2.0g of urea was stirred 2 hours at room temperature and then poured into5% aqueous ammonium hydroxide and extracted with toluene. The organicextracts were dried over anhydrous sodium sulfate and evaporated todryness under vacuum. The residue was dissolved in 200 ml of DMF andslowly added to 1 1/2 liter of water containing 1 g of Dabco withvigorous stirring. The air dried product was weighed 5.0 g and wasessentially identical to the product of part A above.

C.

In a procedure similar to that described in Example 5 was employed, 1.7g of thionyl chloride was added to a mixture of 100 ml of benzene and 50ml of 1,2-dichloroethane. After 4.7 g of2-[4-(diethylamino-2-methylbenzoyl]benzoic acid was added, the reactionmixture was warmed to 60° C. to obtain a clear solution. When thesolution had cooled to 40° C., a solution of 3.5 g of4,4'-bis(dimethylamino)diphenylamine and 1 ml of pyridine in 50 ml1,2-dichloroethane was added and the mix heated to 60° C. for one hour,cooled and stirred overnight at room temperature. The tary materialwhich separated was filtered, washed and dissolved in dimethylformamide.Addition to an excess of water yielded 4.2 g of a light grape-coloredsolid which developed a black color on silica gel.

EXAMPLE 44

Following a procedure similar to that described in Example 4 butemploying 6.2 g of 5-(dimethylamino)-2-[4-(dimethylamino)benzoyl]benzoicacid and 5.0 g of 4,4'-bis-(dimethylanino)diphenylamine there wasobtained 6.6 g of6-(dimethylamino)-3-[4-(dimethylamino)phenyl]-3-{bis[4-(dimethylamino)phenyl]amino}-phthalide,m.p. 86°-92° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a brown-colored image which changed togreen on clay after fluorescent light exposure.

EXAMPLE 45

Following a procedure similar to that described in Example 4 butemploying 1.4 g of5-(dimethylamino)-2-[4-(N-ethyl-N-benzylamino)benzoyl]benzoic acid and0.8 g of 4,4'-bis-(dimethylamino)diphenylamine there was obtained 1.0 gof6-(dimethylamino)-3-[4-(N-ethyl-N-benzyl)aminophenyl]-3-}bis[4-(dimethylamino)phenyl]amino}phthalide,m.p. 137°-148° C. A toluene solution of the product contacted withacidic clay or phenolic resin developed a dark brown-colored image whichchanged to green on clay after fluorescent light exposure.

EXAMPLE 46 A.

To a stirred mixture containing 36 g. of 4-(and 5-)carboxy-2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid (prepared fromtrimellitic anhydride and 3-(diethylamino)phenol, 60 ml. of diethylsulfate and 450 ml. of acetone at 35° C. was added dropwise over 2 hoursa solution containing 25 g. of potassium hydroxide in 75 ml. of water.When the addition was complete stirring was continued an additional 2hours. Another 20 g. of potassium hydroxide in 60 ml. of water was addedand the mixture was heated under reflux 1 hour. Solvent was then allowedto distill until the internal temperature reached 96° C. The reactionmixture was maintained at 96° C. 0.5 hour then stirred at roomtemperature overnight, diluted with 100 ml. of water and brought to pH4.0 with 3N hydrochloric acid. The resulting red precipitate wascollected, washed with water and air-dried to give 37 g. of 4-(and 5-)carboxy-2-[4-(diethylamino)-2-ethoxybenzoyl]benzoic acid, m.p. 63°-96°C. which was used without further purification.

B.

A mixture containing 8.0 g. of 4-(and5-)carboxy-2-[4-(diethylamino)-2-ethoxybenzoyl]benzoic acid, 8.0 g. of4-(dimethylamino)-4'-(diethylamino)diphenylamine, 25 ml. of aceticanhydride and 2 ml. of pyridine was stirred 2 hours at room temperature.The mixture was poured into toluene and the product extracted with 10%aqueous ammonia. The aqueous alkaline extracts were acidified to pH 5with 3N hydrochloric acid. The resulting precipitate was collected,washed with water and dried to give 4.8 g of 5-(and6-)carboxy-3-[4-(diethylamino)-2-ethoxyphenyl]-3-{[4-(dimethylamino)phenyl][4-(diethylamino)phenyl]amino}-phthalide,m.p. 167°-173° C.

C.

To a mixture containing 4.0 g. of the above acid, 4.0 g. of potassiumcarbonate and 100 ml. of N,N-dimethylformamide was added 4.0 g. ofdimethyl sulfate. After stirring for one hour, the reaction mixture waspoured into 1 liter of water containing 10 ml. of concentrated ammoniumhydroxide. The resulting precipitate was collected, washed with waterand dried to give 0.2 g. of 5-(and6-)methoxycarbonyl-3-[4-(diethylamino)-2-ethoxyphenyl]-3-{[4-(dimethylamino)phenyl][4-(diethylamino)phenyl]amino}phthalide,m.p. 87°-93° C. A toluene solution of the product contacted with acidicclay or phenolic resin developed a brown-black colored image.

EXAMPLE 47

A mixture containing 2.0 g. (0.005 mole) of 4-(and5-)carboxy-2-[4-(diethylamino)-2-ethoxybenzoyl]benzoic acid, 0.9 g.(0.005 mole) of diphenylamine, 6 ml. of acetic anhydride and 1 ml. ofpyridine was stirred 2 hrs. at room temperature. Following the additionof 6 ml. of N,N-dimethylformamide the mixture was poured slowly into 130ml. of cold water and stirred 0.25 hr. The resulting solid product wascollected by filtration, washed with water and dried to give 2.5 g. of5-(and6-)carboxy-3-[4-(diethylamino)-2-ethoxyphenyl]-3-(diphenylamino)phthalide,m.p. 117°-125° C. (dec.). The product developed a red image on silicagel, acidic clay and phenolic resin.

EXAMPLE 48

To a stirred mixture containing 2.1 g. of 5-(and6-)carboxy-3-[4-(diethylamino)-2-ethoxyphenyl]-3-(diphenylamino)phthalide,1.0 g. of potassium carbonate and 25 ml. of N,N-dimethylformamide at 40°C. was added 1.5 g. of dimethyl sulfate. After stirring 2 hr. at 40° C.,the reaction mixture was poured into water and the product extractedwith toluene. The toluene extracts were washed with water and saturatedaqueous sodium chloride and evaporated to dryness under vacuum to give1.7 g. of 5-(and6-)methoxycarbonyl-3-[4-(diethylamino)-2-ethoxyphenyl]-3-(diphenylamino)phthalideas a light-brown oil. The product developed a red image on acidic clayand phenolic resin.

EXAMPLE 49

Following a procedure similar to that described in Example 47 butsubstituting for diphenylamine 1.33 g. (0.005 mole) of4,4'-bis(dimethylamino)diphenylamine there was obtained 2.65 g. of5-(and6-)carboxy-3-[4-(diethylamino)-2-ethoxyphenyl]-3-{bis[4-(dimethylamino)phenyl]amino}phthalide,m.p. 165°-175° C. The product developed a black image on silica gel oracidic clay and a grape image on phenolic resin.

EXAMPLE 50

Following a procedure similar to that described in Example 48 butemploying 2.0 g. of 5-(and6-)carboxy-3-[4-diethylamino)-2-ethoxyphenyl]-3-{bis[4-(dimethylamino)phenyl]amino}phthalide,1.0 g. of potassium carbonate, 1.5 ml. of diethyl sulfate and 30 ml. ofN,N-dimethylformamide there was obtained 0.5 g. of 5-(and6-)ethoxycarbonyl-3-[4-(diethylamino)-2-ethoxyphenyl]-3-{bis[4-(dimethylamino)phenyl]amino}phthalideas a brown oil. The product developed a brown-black image on acidic clayand phenolic resin.

EXAMPLE 51

Following a procedure similar to that described in Example 47 butemploying 3.9 g. of 4-(and5-)carboxy-2-[4-(dimethylamino)-2-ethoxybenzoyl]benzoic acid, 4.0 g. of4,4'-dioctyldiphenylamine and substituting for the pyridine 0.5 g. ofurea, there was obtained 5.8 g. of 5-(and6-)carboxy-3-[4-diethylamino)-2-ethoxyphenyl]-3-[bis(4-octylphenyl)amino]phthalidewhich softened at 230° C. but did not melt below 300° C.

EXAMPLE 52

Following a procedure similar to that described in Example 48 butemploying 5.5 g, of 5-(and6-)carboxy-3-[4-(diethylamino)-2-ethoxyphenyl]-3-[bis(4-octylphenyl)amino]-phthalide,3.0 g. of potassium carbonate and 4 ml. of dimethyl sulfate there wasobtained 5-(and6-)methoxycarbonyl-3-[4-(diethylamino)-2-ethoxyphenyl]-3-[bis(4-octylphenyl)amino]phthalideas a light brown oil. The product developed a red image on acidic clayand phenolic resin.

EXAMPLE 53 A.

To a stirred mixture containing 9.6 g. (0.05 mole) of ground trimelliticanhydride and 16.3 g. (0.1 mole) of N,N-diethyl-m-toluidine in 100 ml.of dry chlorobenzene at 5° C. was added 20.0 g. (0.15 mole) of aluminumchloride. After stirring overight at room temperature the reactionmixture was poured into 300 g. of ice-water and stirred for 1 hr. Theprecipitated solid was collected, washed with water and dried. The crudeproduct was dissolved in 105 ml. of 5% aqueous sodium hydroxide, stirred10 min. and filtered to remove insoluble material. The filtrate wascooled to 5° C. and acidified with 10% hydrochloric acid. The resultingproduct was collected, washed with water and dried to give 6.7 g. of4-(and 5-)carboxy-2-[4-(diethylamino)-2-methylbenzoyl]benzoic acid,m.p. >300° C.

B.

Following a procedure similar to that described in Example 47 butemploying 3.6 g. of 4-(and5-)carboxy-2-[4-(diethylamino)-2-methylbenzoyl]benzoic acid and 4.0 g.of 4,4'-dioctyldiphenylamine there was obtained 6.8 g. of 5-(and6-)carboxy-3-[4-(diethylamino)-2-methylphenyl]-3-[bis(4-octylphenyl)amino]phthalide,m.p. 99°-102° C. The product developed a purple-red image on silica gel,acidic clay and phenolic resin.

EXAMPLE 54

Following a procedure similar to that described in Example 48 butemploying 6.0 g. of 5-(and6-)carboxy-3-[4-(diethylamino)-2-methylphenyl]-3-[bis(4-octylphenyl)amino]-phthalide,3.0 g. of potassium carbonate and 5 ml. of dimethyl sulfate, there wasobtained 5-(and6-)methoxycarbonyl-3-[4-(diethylamino)-2-methylphenyl]-3-[bis(4-octylphenyl)amino]-phthalidewhich developed a red image on acidic clay and phenolic resin.

EXAMPLE 55

Following a procedure similar to that described in Example 47 butemploying 4-(and 5-)carboxy-2-[4-(diethylamino)-2-methylbenzoyl]benzoicacid and 4,4'-bis(dimethylamino)diphenylamine there was obtained 5-(and6-)carboxy-3-[4-(diethylamino)-2-methylphenyl]-3-{bis[4-(dimethylamino)phenyl]amino}phthalideas a black solid, m.p.>300° C. This product developed a black image onsilica gel, acidic clay and phenolic resin.

EXAMPLE 56

Following a procedure similar to that described in Example 47 butemploying 3.6 g. of 4-(and5-)carboxy-2-[4-(diethylamino)-2-methylbenzoyl]benzoic acid, 1.9 g. ofdiphenylamine and substituting for the pyridine 0.2 g. of urea there wasobtained 4.5 g. of 5-(and6-)carboxy-3-[4-(diethylamino)-2-methylphenyl]-3-(diphenylamino)phthalide,m.p. 265° C. (dec.).

EXAMPLE 57

Following a procedure similar to that described in Example 48 butemploying 4.0 g. of 5-(and6-)carboxy-3-[4-(diethylamino)-2-methylphenyl]-3-(diphenylamino)phthalide,2.0 g. of potassium carbonate and dimethyl sulfate, there was obtained1.6 g. of 5-(and6-)methoxycarbonyl-3-[4-(diethylamino)-2-methylphenyl]-3-(diphenylamino)phthalide,m.p. 240° C. (dec.) The product developed a bluish-red image on acidicclay and phenolic resin.

EXAMPLE 58 A.

Following a procedure similar to that described in Example 53A butemploying 9.6 g. (0.05 mole) of ground trimellitic anhydride, 12.1 g.(0.1 mole) of N,N-dimethylaniline and 20.0 g. (0.15 mole) of aluminumchloride there was obtained 14.5 g. of 4-(and5-)carboxy-2-[4-(dimethylamino)benzoyl]benzoic acid, m.p.>300° C.

B.

Following a procedure similar to that described in Example 47 butemploying 1.63 g. (0.005 mole) of 4-(and5-)carboxy-2-[4-(dimethylamino)benzoyl]benzoic acid, 1.1 g. (0.005 mole)of 4-ethoxy-N-phenylaniline and 1 ml. of pyridine there was obtained2.46 g. of 5-(and6-)carboxy-3-[4-(dimethylamino)-phenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalide,m.p. 155°-162° C. (dec.). The product developed an orange image onsilica gel, acidic clay and phenolic resin.

EXAMPLE 59

Following a procedure similar to that described in Example 48 butemploying 2.0 g. of 5-(and6-)carboxy-3-[4-(dimethylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]phthalide,1.0 g. of potassium carbonate and 1.5 g. of dimethyl sulfate there wasobtained 1.6 g. of 5-(and6-)methoxycarbonyl-3-[4-(dimethylamino)phenyl]-3-[(4-ethoxyphenyl)phenylamino]phenylamino]phthalide,m.p. 204°-210° C. The product developed an orange image on acidic clayand phenolic resin.

EXAMPLE 60

Following a procedure similar to that described in Example 47 butsubstituting for diphenylamine, 1.33 g. (0.005 mole) of4,4'-bis(dimethylamino)diphenylamine there was obtained 2.5 g. of 5-(and6-)carboxy-3-[4-(dimethylamino)phenyl]-3-{bis[4-(dimethylamino)phenyl]amino}phthalide,m.p. 160°-170° C. (dec.). The product developed a brown image on silicagel, acidic clay and phenolic resin.

EXAMPLE 61

Following a procedure similar to that described in Example 48 butemploying 2.4 g. of 5-(and6-)carboxy-3-[4-dimethylamino)phenyl]-3-{bis[4-(dimethylamino)phenyl]amino}-phthalide,1.0 g. of potassium carbonate and 1.5 ml. of diethyl sulfate, there wasobtained 0.24 g. of 5-(and6-)ethoxycarbonyl-3-[4-(dimethylamino)phenyl]-3-{bis[4-(dimethylamino)phenyl]-amino}phthalide, m.p. 73°-80° C. The product developed a brown image onacidic clay and a grape image on phenolic resin.

EXAMPLE 62

Following a procedure similar to that described in Example 47 butemploying 3.1 g. of 4-(and5-)carboxy-2-[4-(dimethylamino)benzoyl]benzoic acid and 4.0 g. of4,4'-dioctyldiphenylamine there was obtained 6.4 g. of 5-(and6-)carboxy-3-[4-(dimethylamino)phenyl]-3-[bis(4-octylphenyl)amino]phthalidem.p. 110°-113° C.

EXAMPLE 63

Following a procedure similar to that described in Example 48 butemploying 6.0 g. of 5-(and6-)carboxy-3-[4-(dimethylamino)phenyl]-3-[bis(4-octylphenyl)amino]phthalide,3.0 g. of potassium carbonate and 5 ml. of dimethyl sulfate, there wasobtained 5.2 g. of 5-(and6-)methoxycarbonyl-3-[4-(dimethylamino)phenyl]-3-[bis(4-octylphenyl)amino]phthalide,m.p. 83°-89° C. The product developed a deep orange image on acidic clayand phenolic resin.

EXAMPLE 64

Following a procedure similar to that described in Example 47 butemploying 3.1 g. of 4-(and5-)carboxy-2-[4-(dimethylamino)benzoyl]benzoic acid, 1.9 g. ofdiphenylamine and substituting for the pyridine 0.2 g. of urea there wasobtained 4.4 g. of 5-(and6-)carboxy-3-[4-(dimethylamino)phenyl]-3-(diphenylamino)phthalide, m.p.260° C. (dec.).

EXAMPLE 65

Following a procedure similar to that described in Example 48 butemploying a 4.0 g. of 5-(and6-)carboxy-3-[4-(dimethylamino)phenyl]-3-(diphenylamino)phthalide, 2.0g. of potassium carbonate and dimethyl sulfate, there was obtained 2.9g. of 5-(and6-)methoxycarbonyl-3-[4-(dimethylamino)phenyl]-3-(diphenylamino)phthalide,m.p. 250° C. (dec.). The product developed an orange image on acidicclay and phenolic resin.

EXAMPLE 66

Following a procedure similar to that described in Example 2 butemploying 5.4 g. of 2-[4-(dimethylamino)benzoyl]-benzoic acid, 6.8 g. ofN-phenyl-4-(p-toluenesulfonamido)aniline and 1.0 g. of urea there wasobtained 9.05 g. of3-[4-(dimethylamino)phenyl]-3-{[4-p-toleunesulfonamido)phenyl]phenylamino}-phthalide,m.p. 116°-118° C. The product developed an orange image on acidic clayand phenolic resin.

EXAMPLE 67

Following a procedure similar to that described in Example 2 butemploying 6.3 g. of 2-[4-(diethyamino)-2-methylbenzoyl]benzoic acid, 6.8g. of N-phenyl-4-(p-toluenesulfonamido)-aniline and 1.0 g. of urea therewas obtained 11.3 g. of3-[4-(diethylamino)-2-methylphenyl]-3-{[4-(p-toluenesulfonamido)-phenyl]phenylamino}phthalide, m.p. 91°-110° C. The product developed ared image on acidic clay and phenolic resin.

It is contemplated that by following procedures similar to thosedescribed in Examples 1, 2, 3, 4 and 5 but employing the appropriate2-substituted diarylamines of Formula IV there will be obtained thephthalides of Formula II, Examples 68-100 presented in Table Ahereinbelow.

                                      TABLE A                                     __________________________________________________________________________    Phthalides of Formula II                                                      __________________________________________________________________________    Ex.                                                                              Q.sub.4                                                                         Q.sub.5    Q.sub.6    Q.sub.7                                                                         R.sub.1  R.sub.2                                                                           R.sub.3                             __________________________________________________________________________    68 H H          H          H n-C.sub.4 H.sub.9                                                                      CH.sub.3                                                                          CH.sub.3                            69 H (C.sub.2 H.sub.5).sub.2 N                                                                H          H H        CH.sub.3                                                                          C.sub.6 H.sub.5 CH.sub.2            70 H Br         H          H Br       CH.sub.3                                                                          CH.sub.3                            71 Br                                                                              Br         Br         Br                                                                              (CH.sub.3).sub.2 N                                                                     CH.sub.3                                                                          CH.sub.3                            72 H H          H          H C.sub.2 H.sub.5 O                                                                      C.sub.2 H.sub.5                                                                   C.sub.2 H.sub.5                     73 H (C.sub.4 H.sub.9).sub.2 N                                                                H          H H        CH.sub.3                                                                          C.sub.2 H.sub.5                     74 H H          F          H H        CH.sub.3                                                                          C.sub.6 H.sub.5                     75 H Cl         H          H H        t-C.sub.4 H.sub.9                                                                 t-C.sub.4 H.sub.9                   76 F F          F          F H        CH.sub.3                                                                          p-CH.sub.3 C.sub.6 H.sub.4          77 H H          H          H (sec-C.sub.4 H.sub.9).sub.2 N                                                          sec-C.sub.4 H.sub.9                                                               sec-C.sub.4 H.sub.9                 78 I I          I          I H        CH.sub.3                                                                          CH.sub.3                            79 H H          H          H I        C.sub.4 H.sub.9                                                                   p-C.sub.4 H.sub.9C.sub.6                                                      H.sub.4                             80 H H          (C.sub.2 H.sub.5).sub.2 N                                                                H H        C.sub.2 H.sub.5                                                                   C.sub.4 H.sub.9                     81 H H          (C.sub.4 H.sub.9).sub.2 N                                                                H H        CH.sub.3                                                                          CH.sub.3                            82 H H          H          H (CH.sub.3).sub.2 CHCH.sub.2 O                                                          CH.sub.3                                                                          CH.sub.3                            83 H H          H          H H        CH.sub.3                                                                          CH.sub.3                            84 H CO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                        H          H H        CH.sub.3                                                                          CH.sub.3                            85 H H          CO.sub.2 C.sub.8 H.sub.17                                                                H C.sub.2 H.sub.5                                                                        C.sub.2 H.sub.5                                                                   C.sub.2 H.sub.5                     86 H CO.sub.2 C.sub.18 H.sub.37                                                               H          H Cl       CH.sub.3                                                                          CH.sub.3                            87 H CO.sub.2 C.sub.14 H.sub.29                                                               H          H H        CH.sub.3                                                                          CH.sub.3                            88 H H                                                                                         ##STR12## H CH.sub.3 C.sub.2 H.sub.5                                                                   C.sub.2 H.sub.5                     89 H CO.sub.2 H H          H H        CH.sub.3                                                                          CH.sub.3                            90 H H          H          H H        CH.sub.3                                                                          CH.sub.3                            91 H H          H          H CH.sub.3 C.sub.2 H.sub.5                                                                   C.sub.2 H.sub.5                     92 Cl                                                                              Cl         Cl         Cl                                                                              H        CH.sub.3                                                                          CH.sub.3                            93 H H          H          H CH.sub.3 C.sub.2 H.sub.5                                                                   C.sub.2 H.sub.5                     94 H H          H          H CH.sub.3 C.sub.2 H.sub.5                                                                   C.sub.2 H.sub.5                     95 H CO.sub.2.sup.⊖ Na.sup.⊕                                                      H          H H        CH.sub.3                                                                          CH.sub.3                            96 H H          CO.sub.2.sup.⊖ NH.sub.4.sup.⊕                                                H H        CH.sub.3                                                                          CH.sub.3                            97 H CO.sub.2.sup.⊖ HN.sup.⊕ (C.sub.2 H.sub.5).sub.3                              H          H H        C.sub.2 H.sub.5                                                                   C.sub.6 H.sub.5 CH.sub.2            98 H CO.sub.2.sup.⊖ H.sub.3 N.sup.⊕ C.sub.18 H.sub.37                             H          H CH.sub.3 C.sub.2 H.sub.5                                                                   C.sub.2 H.sub.5                     99 H H          CO.sub.2.sup.⊖ H.sub.3 N.sup.⊕ C.sub.8                            H.sub.17   H H        CH.sub.3                                                                          CH.sub.3                            100                                                                              H H          H          H CH.sub.3 C.sub.2 H.sub.5                                                                   C.sub.2 H.sub.5                     __________________________________________________________________________                             Ex.                                                                              Y.sub.1 Y.sub.2                                                                           Y.sub.3 Y.sub. 4                      __________________________________________________________________________                             68 H       H   3-I     H                                                      69 H       H   2-C.sub.2 H.sub.5                                                                     H                                                      70 H       H   4-Br    H                                                      71 H       H   3-(t-C.sub.4 H.sub.9)                                                                 H                                                      72 2-CH.sub.3                                                                            H   4-CH.sub.3 O                                                                          H                                                      73 3-Br    H   5-Br    H                                                      74 H       H   2-F     H                                                      75 2-Cl    H   4-F     H                                                      76 3-CH.sub.3 O                                                                          H   3-CH.sub.3 O                                                                          H                                                      77 H       H   H       H                                                      78 H       H   4-OH    H                                                      79 3-CH.sub.3                                                                            4-CH.sub.3                                                                        3-CH.sub.3                                                                            4-CH.sub.3                                             80 3-C.sub.4 H.sub.9 O                                                                   H   3-C.sub.4 H.sub.9 O                                                                   H                                                      81 H       H                                                                                  ##STR13##                                                                            H                                                      82 2-Cl    4-Cl                                                                              2-Cl    4-Cl                                                   83 H       H   4-NHSO.sub.2 C.sub.6 H.sub.5                                                          H                                                      84 4-CH.sub.2 C.sub.6 H.sub.5                                                            H   H       H                                                      85 2-CO.sub.2 C.sub.4 H.sub.9                                                            H   H       H                                                      86                                                                                ##STR14##                                                                            H   H       H                                                      87 2-CO.sub.2 C.sub.2 H.sub.5                                                            H   H       H                                                      88 4-CO.sub.2 CH.sub.3                                                                   H   H       H                                                      89 2-CO.sub.2 H                                                                          H   H       H                                                      90 4-NH.sub.2                                                                            H   H       H                                                      91 4-NH.sub.2                                                                            H   4-NH.sub.2                                                                            H                                                      92 4-NHC.sub.4 H.sub.9                                                                   H   4-NHC.sub.4 H.sub.9                                                                   H                                                      93                                                                                ##STR15##                                                                            H   H       H                                                      94 4-NHCOC.sub.4 H.sub.9                                                                 H   4-NHCOC.sub.4 H.sub.9                                                                 H                                                      95 4-OC.sub.2 H.sub.5                                                                    H   H       H                                                      96 H       H   H       H                                                      97 4-OC.sub.2 H.sub.5                                                                    H   H       H                                                      98 H       H   H       H                                                      99 4-OC.sub.2 H.sub.5                                                                    H   H       H                                                      100                                                                              4-NHCH(CH.sub.3).sub.2                                                                H   H       H                             __________________________________________________________________________

EXAMPLE 101

The color formers of Examples 2 and 7 were microencapsulated as follows.A solution containing 1 g. of the color former in 49 g. ofisopropylbiphenyl and a solution containing 5 g. ofcarboxymethylcellulose in 200 ml. of water were mixed and emulsified byrapid stirring. The desired particle size (5 microns) was checked bymicroscope . To the emulsion was added a solution containing 15 g. ofpigskin gelatin in 120 ml. of water. The pH was adjusted to 6.5 with 10%aqueous sodium hydroxide with rapid stirring, and following the gradualaddition of 670 ml. of water with heating (at 50° C.) the pH wasadjusted to 4.5 with 10% aqueous acetic acid with continued rapidstirring. After 5 minutes 10 g. of 25% aqueous glutaraldehyde was addedand rapid stirring was continued an additional 15 minutes. The resultingmicrocapsule dispersion was stirred more slowly overnight.

Starch (12 g.) was gradually added to 60 ml. of water. The mixture washeated to 90° C. and stirred 15 minutes. After cooling to roomtemperature the mixture was added to 473 g. of the above microcapsuledispersion and the resulting emulsion stirred vigorously for 2 minutes,and then coated on white typewriter paper sheets (0.0015 in. filmthickness). The sheets were air dried. Duplicate typewritten images weremade on receiving sheets coated with either phenolic resin or acidicclay. The color former of Example 2 produced an orange image on bothtypes of receiving sheets, and the color former of Example 7 produced ared image on both types of receiving sheets.

EXAMPLE 102

Polyvinyl alcohol dispersions of the color formers of Examples 2, 3 and7 were prepared by shaking 1 hour on a paint shaker a mixture containing2.0 g. of the color former, 3.7 g. of water, 8.6 g. of 10% aqueouspolyvinyl alcohol and 10 g. of zirconium grinding beads. A polyvinylalcohol dispersion of bisphenol A was prepared by shaking a mixturecontaining 9.8 g. of bisphenol A, 18.2 g. of water, 42 g. of 10% aqueouspolyvinyl alcohol and 70 ml. of zirconium grinding beads. The coatingmixture was made by combining and thoroughly mixing 2.1 g. of thepolyvinyl alcohol dispersion of the color former with 47.9 g. of thepolyvinyl alcohol dispersion of bisphenol A. The coating mixture wasapplied (at thicknesses of 0.003 in. and 0.0015 in.) to white mimeopaper sheets and the sheets were dried at room temperature. Contactingthe coated sheets with a heated stylus at a temperature between 110° C.and 150° C. produced a dark orange image on the sheet coated with thecolor former of Example 2, a dark red image on the sheet coated with thecolor former of Example 3 and a dark purple image on the sheet coatedwith the color former of Example 7.

EXAMPLE 103

Following a procedure similar to that described in Example 101 butsubstituting kerosene for isopropylbiphenyl the color former of Example32 was microencapsulated and coated on a transfer sheet. The colorformer developed a red image on both types of receiving sheets.

EXAMPLE 104

Following a procedure similar to that described in Example 101 butomitting the addition of starch to the microcapsule dispersion, thecolor former of Example 43 was microencapsulated and coated on atransfer sheet. The color former developed a black image on both typesof receiving sheets. The image formed on the clay-coated receiving sheetturned green on standing.

EXAMPLE 105

Following a procedure similar to that described in Example 101 butomitting the addition of starch to the microcapsule dispersion, amixture containing 0.876 g. of the color former of Example 16 and 0.584g. of crystal violet lactone was microencapsulated and coated on atransfer sheet. The mixture of color formers developed a blue to blackimage on resin-coated receiving sheets.

We claim:
 1. A process for producing a compound having the formula##STR16## which comprises reacting a 2-substituted benzoic acid havingthe formula ##STR17## with a diarylamine having the formula ##STR18## inthe presence of the anhydride of an alkanoic acid having from 2 to 5carbon atoms and an organic base, wherein in the above formulas:Q₄ ishydrogen or halo; Q₅ is the same as Q₄ ; or di-lower-alkylamino, halo orCOX when Q₄, Q₆ and Q₇ are each hydrogen; Q₆ is the same as Q₄ ; ordi-lower-alkylamino, halo or COX when Q₄, Q₅ and Q₇ are each hydrogen;Q₇ is the same as Q₄ ; X is hydroxyl, benzyloxy or alkoxy having from 1to 18 carbon atoms; Z is a radical having the formula ##STR19## inwhich: R₁ is selected from the group consisting of hydrogen, halo,lower-alkyl, lower-alkoxy and di-lower-alkylamino; R₂ is lower-alkyl;and R₃ is selected from the group consisting of lower-alkyl, benzyl,phenyl and phenyl substituted with a lower-alkyl or lower-alkoxy group;and Y₁, Y₂, Y₃ and Y₄ are the same or different and are selected fromthe group consisting of hydrogen, halo, hydroxyl, lower-alkoxy, alkylhaving from 1 to 9 carbon atoms, phenyl-lower-alkyl, COOR₄ and NR₅ R₆where R₄ and R₅ are hydrogen or lower-alkyl and R₆ is hydrogen,lower-alkyl, cycloalkyl having from 5 to 7 carbon atoms, lower-alkanoyl,phenylsulfonyl or lower-alkyl-substituted phenylsulfonyl.
 2. A processaccording to claim 1 wherein said anhydride of an alkanoic acid havingfrom 2 to 5 carbon atoms is acetic anhydride and said organic base isselected from the group consisting of said diarylamine, pyridine andurea.
 3. A process for producing a compound having the formula ##STR20##which comprises reacting a 2-substituted benzoic acid having the formula##STR21## with a diarylamine having the formula ##STR22## in thepresence of the anhydride of an alkanoic acid having from 2 to 5 carbonatoms and an organic base, wherein in the above formulas:Q₄, Q₅, Q₆ andQ₇ are hydrogen; Z is 9-julolidinyl; and Y₁, Y₂, Y₃ and Y₄ are the sameor different and are selected from the group consisting of hydrogen,lower-alkoxy and alkyl having from 1 to 9 carbon atoms.
 4. A processaccording to claim 3 wherein said anhydride of an alkanoic acid havingfrom 2 to 5 carbon atoms is acetic anhydride and said organic base isselected from the group consisting of said diarylamine, pyridine andurea.
 5. 4-Carboxy-2-[2-ethoxy-4-(dimethylamino)benzoyl]benzoic acid. 6.5-Carboxy-2-[2-ethoxy-4-(dimethylamino)benzoyl]benzoic acid.